/*
 * Copyright 2010-2011 WebEqua Team
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.mathcloud.math.core.matlab.manager;

// import class slf4j
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
//import class Matlab4WebEqua
import Matlab4WebEqua.MatlabEngine;

public class MatlabSupervisor {
	private static MatlabEngine mtlbEngine = null;
	private static int mtlbVarId = 0;
	private static final Logger log = LoggerFactory.getLogger(MatlabSupervisor.class);
	
	public static int getVarId()
	{
		mtlbVarId ++;
		return mtlbVarId;
	}
	
	public static synchronized MatlabEngine getMatlabEngine()
	{
		if (mtlbEngine!=null)
			return mtlbEngine;
		else
		{
			try
			{
				log.info("Create new MatlabEngine.");
				mtlbEngine = new MatlabEngine();
				return mtlbEngine;

			} catch (Exception e)
			{
				log.error("Exception:",e);
				return null;
			}			
		}
	}
	
	public static void dispose() {
        try 
        {
        	if (mtlbEngine != null) {
        		log.info("Dispose MatlabEngine.");
        		mtlbEngine.dispose();
        	}
		
		} catch (Exception e)
		{
			log.error("Exception:",e);
		}
	}
	
	@Override
	protected void finalize() {
		dispose();
	}
}